ASoC: tlv320aic32x4: Move aosr and dosr setting to separate functions

commit fbafbf65 upstream.

Move these to separate helper functions.  This looks cleaner and fits
better with the new clock setting in CCF.

Signed-off-by: Annaliese McDermond <nh6z@nh6z.net>
Signed-off-by: Mark Brown <broonie@kernel.org>